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I like your idea and willingness to experiment with this.
My experience with my indoor 1/2″ pipe base loaded antenna is that it doesn’t take much external influence (me getting near it) to spoil the resonance. I wonder if your corrugated pipe may bend in the wind and cause the same sort of detuning. Perhaps another benefit of lowering the Xc would be to make your antenna less sensitive to mechanical changes.
Just something to look for when you try it.